In the United States, two thirds of the carbon monoxide and
about one third of carbon dioxide emissions come from the
transportation sector. Ways to reduce these emissions in the
future include replacing gasoline and diesel by biofuels, or by
blend of biofuels with conventional gasoline and diesel, or by
compressed natural gas (CNG), or by replacing internal
combustion engines by electric motors powered by hydrogen
fuel cells or battery-powered electric vehicles recharged from
the electric grid. This presentation will review these
technologies the fuel production pathways, when they are likely
to be available, and by what fraction transportation sector green
house gas emissions could be reduced by each.
A well-to-wheels (WTW) analysis is performed on each
vehicle/ fuel technology using the GREET model and the total
energy use, the CO 2 emissions, NO x emissions, SO x emissions
for the life cycle of the vehicle technologies are calculated.
Prospects for reducing foreign oil dependence as well as
mitigating green house gases emission from the transportation
sector will be considered in the analysis.